>> we took a reading of the environment. we found 75 parts per million. to put that into perspective, we don our breathing gear at 25 parts per million. >> saved my life. that's all i can tell you. >> reporter: max actually is a rescue dog. jack got him from german shepherd rescue of northern california about a year ago. now max is a hero. >> a hero who besides food that is just wants one thing. to go riding around town with jack in the pickup. jack says, max can ride anywhere he wants. >> aww look at you, aww! >> reporter: jack says max may not always be the most obedient dog but he sure knew what to do last week. in marin county, don ford, kpix 5. >> amazing story. >>> we get away with it all the time. but one airline says you can't sneak by anymore with oversized carry-ons. the new crackdown that could cost you. ,, i want you to know stuff i want you to be kind. i want you to be smart. super smart. i want one thing in a doctor. to speak my language. i don't want you to look at the chart before you say hi...david. quiero que me hagas sentir segura. i wa